k.Besides site maintenance work changes along with seasonal climate and requires differently on the focal point and standard of maintenance. However, there are still many problems like low operating standards,leak of repair of maintenance, short-term maintenance,missing repair of unnoticeable faults because much work are carried back and forth from year to year.Therefore, many times the status repairs e fault repairs and miss the best timing. I do hope this paper may arouse my and other signal workers ‘interest of daily maintenance thus to eliminate faults in the bud and decrease the personal injury or substantial property damage resulted from the fast-speed switches.РKey Words: ZYJ7 Electro-hydraulic Switch Machine;Fail-Safe;Routine MaintenanceР Р Р Р目录Р1 绪论?10Р1.1 研究背景?10Р1.2 研究目的与意义?10
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